Arche du Plannier, located off Île Maïre, is a reef and cave site featuring a distinctive arch formation. Suitable for intermediate divers, the site reaches depths of 30 metres with visibility ranging from 10 to 25 metres. Divers encounter various marine life, including wrasses, Turkish wrasse, scorpionfish, and flatworms. Rarer sightings include ocean sunfish, Mediterranean moray, and great barracuda, alongside nudibranchs like the Mediterranean violet aeolid and tricolor doris. The site experiences mild currents, though surge and swell can be unpredictable, particularly within the arch and cave sections. A torch is recommended for exploring the darker cave areas. Boat access is required, and water temperatures fluctuate between 13C and 19C.

La pierre à la bague is a complex site off the Île Maïre featuring a diverse topography of reef, wall, cave, and wreck structures. This site is strictly for intermediate divers, with depths ranging from 23 to 40 metres and an average depth of 30 metres. Access is by boat only, and divers must be prepared for strong currents and significant surge. Visibility is variable, often reaching 5 metres. Given the depth, potential for nitrogen narcosis, and entanglement hazards within the wreck and cave sections, advanced buoyancy control and drift diving experience are required. Night diving is permitted at this location.

Le Middlebury Victory is a reef dive located at Île Maïre in the Riou Archipelago. The site features depths between 10 and 15 metres, making it suitable for beginner divers. Access is by boat, and the site is subject to moderate currents. Visibility typically ranges from 10 to 30 metres, providing clear conditions for navigating the reef. Water temperatures fluctuate between 13 and 20 degrees Celsius throughout the year, requiring appropriate thermal protection during cooler months. Divers should coordinate with local operators to manage current patterns effectively and ensure safe navigation of the area.

La Plaine is a reef dive located off Île Maïre in the Riou Archipelago. Reaching depths of 10 to 15 metres, this site is well-suited for beginners looking for a straightforward underwater experience. Divers can expect visibility between 10 and 30 metres, providing clear views of the reef structure. A moderate current is common here, requiring careful planning; it is recommended to start the dive heading into the current and drift back. Access is exclusively by boat from Marseille. Water temperatures fluctuate throughout the year, ranging from 13C in February to 21C during the peak summer months of July and August.

Pierre de Briançon is a diverse dive site located off Île Jarre in the Riou Archipelago. This site offers a combination of reef, cave, and drift diving at depths ranging from 15 to 35 metres, with an average depth of 25 metres. Access is strictly by boat, as the site lies 3000 metres from the shore. Divers encounter a variety of marine life, including common wrasses, cow snails, and yellow zoanthids. Less frequently, divers may spot Mediterranean moray, common octopus, scorpionfish, and various nudibranchs such as Felimare villafranca and Tricolor doris. The site features mild currents and visibility between 10 and 30 metres, though divers should be aware of potential entanglement and overhead environment hazards.

Grotte de l'Arc en Ciel, located at Île Jarre in the Riou Archipelago, offers a diverse underwater experience combining cave and reef topography. Divers can explore depths ranging from 3 to 25 metres, with an average depth of 15 metres. The site is accessible by both boat and shore, featuring mild currents and visibility between 10 and 30 metres. As the cave section presents an overhead environment, divers must maintain awareness of their surroundings and are strongly advised to use guided tours provided by local dive shops. The site is suitable for beginners, though proper training for overhead environments is essential for navigating the cave safely.

La grotte sans fond is a cavern dive located off Île Jarre in the Riou Archipelago. The site features a cavern structure situated between 15 and 20 metres depth, with an average depth of 17 metres. Visibility typically ranges from 10 to 30 metres, allowing for navigation within the overhead environment. The site is characterised by a lack of current, though divers must manage the risks associated with an overhead environment, including potential entanglement. Access is strictly by boat, as surf and shore breaks make shoreline entry dangerous. This site is suited for intermediate divers who possess solid buoyancy control and awareness of their air supply.

La Grotte Mystérieuse, located off Île Jarre, offers a diverse underwater landscape featuring a cave system, reef, and drop-off. Divers typically explore between 12 and 26 metres, with an average depth of 19 metres. The site is suitable for beginners, though the overhead environment of the cave requires strict buoyancy control and careful depth monitoring. Visibility ranges from 10 to 30 metres, and currents are generally mild. A torch is recommended for navigating the darker cave interior. Access is by boat only, and divers should arrange air fills and equipment in Marseille before departure. A typical dive lasts 50 minutes.